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| 1 | Chaos correlation optical time domain reflectometry显示文摘We propose a novel correlation optical time domain reflectometry (C-OTDR) of using broadband chaotic light. This reflectometry has the advantage over the conventional OTDR and the pseudorandom signal C-OTDR in range-independent spatial resolution. We employ a laser diode with feedback from a long fiber ring cavity as the source of chaotic probe light. Experimental and numerical studies show that the chaotic light has broad and flat spectrum, and excellent correlation properties. Using this broadband chaotic laser, we experimentally demonstrate the proposed chaos C-OTDR for locating the fiber reflection events, and analyze the spatial resolution and dynamic range. The results show that the chaos C-OTDR can realize a range-independent resolution of 6 cm and its dynamic range is at least 25 km. | WANG AnBang & WANG YunCai Department of Physics, College of Science, Taiyuan University of Technology, Taiyuan 030024, China | 2010 | Science China(Information Sciences)2010，53，2： | 10 |
| 2 | 0.75 Gbit/s high-speed classical key distribution with mode-shift keying chaos synchronization of Fabry–Perot lasers显示文摘High-speed physical key distribution is diligently pursued for secure communication.In this paper,we propose and experimentally demonstrate a scheme of high-speed key distribution using mode-shift keying chaos synchronization between two multi-longitudinal-mode Fabry–Perot lasers commonly driven by a super-luminescent diode.Legitimate users dynamically select one of the longitudinal modes according to private control codes to achieve mode-shift keying chaos synchronization.The two remote chaotic light waveforms are quantized to generate two raw random bit streams,and then those bits corresponding to chaos synchronization are sifted as shared keys by comparing the control codes.In this method,the transition time,i.e.,the chaos synchronization recovery time is determined by the rising time of the control codes rather than the laser transition response time,so the key distribution rate is improved greatly.Our experiment achieved a 0.75-Gbit/s key distribution rate with a bit error rate of 3.8×10^(−3)over 160-km fiber transmission with dispersion compensation.The entropy rate of the laser chaos is evaluated as 16 Gbit/s,which determines the ultimate final key rate together with the key generation ratio.It is therefore believed that the method pays a way for Gbit/s physical key distribution. | Hua Gao Anbang Wang Longsheng Wang Zhiwei Jia Yuanyuan Guo Zhensen Gao Lianshan Yan Yuwen Qin Yuncai Wang | 2021 | Light(Science & Applications)2021，10，9： | 7 |
| 3 | Modulation format identification in fiber communications using single dynamical node-based photonic reservoir computing显示文摘We present a simple approach based on photonic reservoir computing(P-RC)for modulation format identification(MFI)in optical fiber communications.Here an optically injected semiconductor laser with self-delay feedback is trained with the representative features from the asynchronous amplitude histograms of modulation signals.Numerical simulations are conducted for three widely used modulation formats(on–off keying,differential phase-shift keying,and quadrature amplitude modulation)for various transmission situations where the optical signal-to-noise ratio varies from 12 to 26 d B,the chromatic dispersion varies from-500 to 500 ps/nm,and the differential group delay varies from 0 to 20 ps.Under these situations,final simulation results demonstrate that this technique can efficiently identify all those modulation formats with an accuracy of>95%after optimizing the control parameters of the P-RC layer such as the injection strength,feedback strength,bias current,and frequency detuning.The proposed technique utilizes very simple devices and thus offers a resource-efficient alternative approach to MFI. | QIANG CAI YA GUO PU LI ADONIS BOGRIS KALAN SHORE YAMEI ZHANG YUNCAI WANG | 2021 | Photonics Research2021，9，1： | 2 |
| 4 | Chemical modification and the photoluminescence stabilization of titanic acid nanotubes显示文摘Titanic acid nanotubes (H2Ti2O4(OH)2) were surface-modified with cetyl alcohol through dehydration reaction because of existence of Ti–OH. The modified nanotubes were characterized by transmission electron microscopy (TEM), Fourier Transform Infrared (FT-IR) spectrometry and pho-toluminescence (PL) spectra. The results indicate that the modified nanotubes can be easily dis-persed into organic solvent such as chloroform and toluene in contrast with the unmodified nanotubes, which makes it easier to be assembled by LB technique. Moreover, the Ti-O-CH2(CH2)14CH3 on the surface of the nanotubes can hinder the adsorption of water and consequently the photoluminescence property of the nanotubes can be stabilized. Even though kept in humid condition or in air for a long time, the modified nanotubes also maintain the special photoluminescence property in the visible re-gion. | ZHANG Xingtang WANG Yumei ZHANG Chunmei JIANG Xiaohong TIAN Baoli LI Yuncai HUANG Yabin DU Zuliang | 2006 | Science China Chemistry2006，49，2： | 2 |
| 5 | Ultrafast and real-time physical random bit extraction with all-optical quantization显示文摘Optical chaos generated by perturbing semiconductor lasers has been viewed,over recent decades,as an excellent entropy source for fast physical random bit generation(RBG)owing to its high bandwidth and large random fluctuations.However,most optical-chaos-based random bit generators perform their quantization process in the electrical domain using electrical analog-to-digital converters,so their real-time rates in a single channel are severely limited at the level of Gb/s due to the electronic bottleneck.Here,we propose and experimentally demonstrate an all-optical method for RBG where chaotic pulses are quantized into a physical random bit stream in the all-optical domain by means of a length of highly nonlinear fiber.In our proof-of-concept experiment,a 10-Gb/s random bit stream is successfully generated on-line using our method.Note that the single-channel real-time rate is limited only by the chaos bandwidth.Considering that the Kerr nonlinearity of silica fiber with an ultrafast response of few femtoseconds is exploited for composing the key part of quantizing laser chaos,this scheme thus may operate potentially at much higher real-time rates than 100 Gb/s provided that a chaotic entropy source of sufficient bandwidth is available. | Ya Guo Qiang Cai Pu Li Ruonan Zhang Bingjie Xu K.Alan Shore Yuncai Wang | 2022 | Advanced Photonics2022，4，3： | 2 |
| 6 | Chaos synchronization of semiconductor lasers over 1040-km fiber relay transmission with hybrid amplification显示文摘Optical chaos communication and key distribution have been extensively demonstrated with high-speed advantage but only within the metropolitan-area network range of which the transmission distance is restricted to around 300 km.For secure-transmission requirement of the backbone fiber link,the critical threshold is to realize long-reach chaos synchronization.Here,we propose and demonstrate a scheme of long-reach chaos synchronization using fiber relay transmission with hybrid amplification of an erbium-doped fiber amplifier(EDFA)and a distributed fiber Raman amplifier(DFRA).Experiments and simulations show that the hybrid amplification extends the chaos-fidelity transmission distance thanks to that the low-noise DFRA suppresses the amplified spontaneous emission noise and self-phase modulation.Optimizations of the hybrid-relay conditions are studied,including launching power,gain ratio of DFRA to EDFA,single-span fiber length,and number of fiber span.A 1040-km chaos synchronization with a synchronization coefficient beyond 0.90 is experimentally achieved,which underlies the backbone network-oriented optical chaos communication and key distribution. | LONGSHENG WANG JUNLI WANG YUSHAN WU YUEHUI SUN SONGSUI LI LIANSHAN YAN YUNCAI WANG ANBANG WANG | 2023 | Photonics Research2023，11，6： | 1 |
| 7 | Health Monitoring of Long-Haul Fiber Communication System Using Chaotic OTDR显示文摘A novel chaotic optical time-domain reflectometry(OTDR)-based approach was proposed for monitoring long-haul fiber communication systems with multiple fiber segments. The self-phase modulation and group velocity dispersion effects of the optical cable was considered in demonstrating the proof-of-concept experiment and simulation. In experiments, the correlation peaks are clearly obtained from the correlation trace between the reference and reflected(or scattered) light signals propagating in three optical-fiber segments. The technique affords a high spatial resolution of 2 m, and further long-haul fiber simulations indicate that the sensing distance can be more than 3300 km. Thus, the new proposed technique can be effectively applied for health monitoring of long-haul fiber communication systems. | Mengmeng Chen Mingjiang Zhang Shaoxiang Chen Jianguo Zhang Senlin Yan Yuncai Wang | 2020 | China Communications2020，17，5： | 1 |
| 8 | Flexible rotation of transverse optical field for 2D self-accelerating beams with a designated trajectory显示文摘Self-accelerating beams have the unusual ability to remain diffraction-free while undergo the transverse shift during the free-space propagation.We theoretically identify that the transverse optical field distribution of 2D self-accelerating beam is determined by the selection of the transverse Cartesian coordinates,when the caustic method is utilized for its trajectory design.Based on the coordinate-rotation method,we experimentally demonstrate a scheme to flexibly manipulate the rotation of transverse optical field for 2D self-accelerating beams under the condition of a designated trajectory.With this scheme,the transverse optical field can be rotated within a range of 90 degrees,especially when the trajectory of 2D self-accelerating beams needs to be maintained for free-space photonic interconnection. | Lei Zhu Xuesong Zhao Chen Liu Songnian Fu Yuncai Wang Yuwen Qin | 2021 | Opto-Electronic Advances2021，4，3： | 1 |
| 9 | Eavesdropping in chaotic optical communication using external-cavity laser as a key显示文摘 | Qingchun Zhao Yuncai Wang Anbang Wang | 2009 | Appl Opt2009，48，18： | 1 |
| 10 | Haemophilus parasuis infection activates the NF-κB pathway in PK-15 cells through IκB degradation显示文摘 | Yushan Chen Hui Jin Ping Chen Zili Li Xianrong Meng Mei Liu Shaowen Li Deshi Shi Yuncai Xiao Xiliang Wang Zutao Zhou Dingren Bi Rui Zhou | 2012 | Veterinary Microbiology (-)2012，，1： | 1 |
| 11 | Coherence length tunable semiconductor laser with optical feedback 显示文摘 | Wang Yuncai Kong Lingqin Wang Anbang | 2009 | Applied Optics2009，48，5： | 1 |
| 12 | Eavesdropping in chaotic optical communication using the feedback length of an external-cavity laser as a key显示文摘 | Zhao Qingchun Wang Yuncai Wang Anbang | 2009 | Applied Optics2009，48，18： | 1 |
| 13 | Enhancing the bandwidth of the optical chaotic signal generated by a semiconductor laser with optical feedback显示文摘 | Wang Anbang Wang Yuncai He Hucheng | 2008 | IEEE Photonics Technology Letters2008，20，19： | 1 |
| 14 | Chaotic correlation optical time domain reflectometer utilizing laser diode 显示文摘 | Wang Yuncai Wang Bingjie Wang Anbang | 2008 | IEEE J Photon Tech Lett2008，20，19： | 1 |
| 15 | Ultra-wide tuning single channel filter based on one-dimensional photonic crystal with an air cavity显示文摘By inserting an air cavity into a one-dimensional photonic crystal of LiF/GaSb, a tunable filter covering the whole visible range is proposed. Following consideration of the dispersion of the materials, through modulating the thickness of the air cavity, we demonstrate that a single resonant peak can shift from 416.1 to 667.3 nm in the band gap at normal incidence by means of the transfer matrix method. The research also shows that the transmittance of the channel can be maximized when the number of periodic Li F/Ga Sb layers on one side of the air defect layer is equal to that of the other side. When adding a period to both sides respectively, the full width at half maximum of the defect mode is reduced by one order of magnitude. This structure will provide a promising approach to fabricate practical tunable filters in the visible region with ultra-wide tuning range. | Xiaodan Zhao Yibiao Yang Zhihui Chen Yuncai Wang Hongming Fei Xiao Deng | 2017 | Journal of Semiconductors2017，38，2： | 1 |
| 16 | What are the appropriate mapping units for ecosystem service assessments?A systematic review显示文摘Context:Without clear understanding of the units used for ecosystem service(ES)mapping,ES assessment accuracy and the practical application of ES knowledge will be hampered.Method:We systematically reviewed 106 studies over the past 11 years to explore the type,characteristic pattern and deficiencies of mapping units.Result:We proposed that ES mapping units can be categorized into minimal unit for assessing ESs using corresponding indicators and methods,and aggregated unit for analysis and application based on research objectives,and classified the mapping units into five common types.Of the 12 characterizing variables of ES mapping studies,some have been shown to introduce a difference in the selection of mapping units and to exhibit characteristic patterns.We also found that the accuracy of ES assessments based on minimal units was lacking,and aggregated units were insufficient to establish a link between ES knowledge and practice.Conclusion:Herein,we propose possible solutions such as the use of fine spatial resolution grids and the introduction of additional data beyond land cover as supplements to improve the assessment accuracy.To enhance the availability of the results for practice,aggregated units connected with urban planning units should be established at a spatial level suitable for urban management. | Jiake Shen Chundi Chen Yuncai Wang | 2021 | Ecosystem Health and Sustainability2021，7，1： | 1 |
| 17 | Generation and evaluation of sub- 15 fs laser pulses显示文摘 | Zhu Changjun Wang Yuncai Zhou Jianying | 2005 | Chinese Physics2005，17，1： | 1 |
| 18 | Microwave-photonic sensor for remote water-level monitoring based on chaotic laser 显示文摘 | JI Yongning ZHANG Mingjiang WANG Yuncai | 2014 | International Journal of Bifurcation and Chaos2014，24，3： | 1 |
| 19 | SPECIAL TOPICS:Chaotic laser brings out higher precision OTDR显示文摘Professor Wang YunCai and his student Wang AnBang reported a new concept of optical time domain reflectometry (OTDR) based on a chaotic light correlation method.This will be useful for precise fault location in fiber links with high-density events.Their work is reported in Issue 53 (February, 2010) of SCIENCE CHINA Information Sciences. | WANG YunCai The authors are affiliated to the Laboratory of Optical Information and Technology, Physics Department, Taiyuan University of Technology. | 2010 | Chinese Science Bulletin2010，55，14： | 1 |
| 20 | Parallel Implementation of the Non-Overlapping Template Matching Test Using CUDA显示文摘NIST(National Institute of Standards and Technology) statistical test recognized as the most authoritative is widely used in verifying the randomness of binary sequences. The Non-overlapping Template Matching Test as the 7 th test of the NIST Test Suit is remarkably time consuming and the slow performance is one of the major hurdles in the testing process. In this paper, we present an efficient bit-parallel matching algorithm and segmented scan-based strategy for execution on Graphics Processing Unit(GPU) using NVIDIA Compute Unified Device Architecture(CUDA). Experimental results show the significant performance improvement of the parallelized Non-overlapping Template Matching Test, the running speed is 483 times faster than the original NIST implementation without attenuating the test result accuracy. | Kaikai Li Jianguo Zhang Pu Li Anbang Wang Yuncai Wang | 2020 | China Communications2020，17，8： | 0 |
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